วันอาทิตย์ที่ 18 พฤศจิกายน พ.ศ. 2555

Sound card interface is a equipment for communication. Any mode using a computer for encode or decode data should be interface for control transceiver. I brought a cheap USB sound card at computer store. Then come to my workbench to making its.

A circuit is simple. Audio output from USB sound card direct to port for connect to mic of transceiver. At a same time audio signal going to control NPN transistor. A transistor I use 2n3904 for switch or control PTT port for transceiver.

I can find many circuit on internet. VOX control is use for this sound card interface.

I have a android tablet for test in 2 or 3 days. Now I have a first time for using android. A testing today I added a SDR application into tablet. Application is glSDR.
In the app have a many share server You can select once for listening from him/her location. About all station share in HF band. If you haven't a amateur licence you can try to listens on this.